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Receivables, net and Contract assets and liabilities	12 Months Ended
Receivables, net and Contract assets and liabilities	Dec. 31, 2023
Receivables, net and Contract assets and liabilities
Receivables, net and Contract assets and liabilities	— Note 8 Receivables, net and Contract assets and liabilities Receivables, net consisted of the following: December 31, ($ in millions) 2023 2022 Trade receivables 7,107 6,478 Other receivables 646 688 Allowance (307) (308) Total 7,446 6,858 “Trade receivables” in the table above includes contractual retention amounts billed to customers of $ 104 million and $ 100 million at December 31, 2023 and 2022, respectively. Management expects that the substantial majority of related contracts will be completed and the substantial majority of the billed amounts retained by the customer will be collected. Of the retention amounts outstanding at December 31, 2023, 61 percent and 28 percent are expected to be collected in 2024 and 2025, respectively. “Other receivables” in the table above consists of value added tax, claims, rental deposits and other non ‑ trade receivables. The reconciliation of changes in the allowance for doubtful accounts is as follows: ($ in millions) 2023 2022 2021 Balance at January 1, 308 339 357 Current-period provision for expected credit losses 47 37 33 Write-offs charged against the allowance (48) (48) (37) Exchange rate differences — (20) (14) Balance at December 31, 307 308 339 The following table provides information about Contract assets and Contract liabilities: December 31, ($ in millions) 2023 2022 2021 Contract assets 1,090 954 990 Contract liabilities 2,844 2,216 1,894 Contract assets primarily relate to the Company’s right to receive consideration for work completed but for which no invoice has been issued at the reporting date. Contract assets are transferred to receivables when rights to receive payment become unconditional. Management expects that the majority of the amounts will be collected within one year of the respective balance sheet date. Contract liabilities primarily relate to up-front advances received on orders from customers as well as amounts invoiced to customers in excess of revenues recognized predominantly on long-term projects. Contract liabilities are reduced as work is performed and as revenues are recognized. The significant changes in the Contract assets and Contract liabilities balances were as follows: 2023 2022 Contract Contract Contract Contract ($ in millions) assets liabilities assets liabilities Revenue recognized, which was included in the Contract liabilities balance at January 1, 2023/2022 (1,311) (1,043) Additions to Contract liabilities - excluding amounts recognized as revenue during the period 1,845 1,481 Receivables recognized that were included in the Contract assets balance at January 1, 2023/2022 (622) (591) The Company considers its order backlog to represent its unsatisfied performance obligations. At December 31, 2023, the Company had unsatisfied performance obligations totaling $ 21,567 million and, of this amount, the Company expects to fulfill approximately 69 percent of the obligations in 2024 , approximately 16 percent of the obligations in 2025 and the balance thereafter.